

AMPHIPODA OF SOTTHERN NEW ENGLAND. 



519 



Woods Hole ami have received specimens from Newport; and a large number of individuals in their 

 tubes were dredged in Narragansett Bay by the Fish Hawk in November, 1899. The latter were all 

 of small size. 



This species differs from difformis Milne-Edwards, with which it has been united, in that thecarpud 

 of the second gnathopods of the male is much broader and stouter, the carpal process being shorter, 

 broader, and devoid of a tooth on the upper margin, and that the propodus is much stouter an. 1 has no 

 prominent tubercle near the base of the lower margin; the basal joints of the first and second perseopods 

 are much broader than in difformw. Rubricornis more closely resembles E. huntt ri, but the propodus 

 of the sec 1 gnathopods in the male in that species has the lower margin straight, more or less lami- 

 nate, and interrupted by a sharp incision in the middle — a feature not shown in the present species. 



Erichthonius minax (Smith). 



Cerapus minax Smith, Rept. U. S. Fish Com. 1871-2, p. 565. 



Eyes large, nearly round; antenna- of subequal length; last two joints of pel uncle of first pair subequal; 

 rlagellum about as long as peduncle, much longer than in the preceding species; second antenna' more 

 slender than in rubricornis and not furnished below with so many nor such longseUe; flagelhun nearly 



u>-.. 



Erichthonius minax. Gnathopods of male and female drawn to same scale. 



as long as peduncle; first gnathopods short, carpus targe, distally widening, setose behind; hand much 

 as in rubricornis, the dactyl acutely serrulate within; second gnathopods in male very large, merusvery 

 small; carpus elongated, produced below- propodus into a very large acute process, which has a very 

 large tooth on its upper edge; propodus narrower than in rubricornis, with a low elevation near distal 

 end of lower margin; dactyl with long seta- at tip; second gnathopod of female very much like those 

 of preceding species; first uropods projecting beyond second and third, peduncle slender and much 

 longer than rami; inner margin of peduncle of second uropods with acute serrations; margins of rami 

 of second and third uropods acutely serrate, the serrations being larger on inner rami, terminal uro- 

 pods and telson much as in the preceding species. 



This species is more closely allied to !■'. difformis than the preceding one; it differs from that species 

 in having no tooth on the inner margin of the propodus of the large hand of the male, in having a large 

 tooth near the middle of the upper side of the large carpal process instead of a small or obsolescent 

 one near the tip, in having much broader basal joints on the first and second per;eopods, and in having 

 longer ami more slender terminal peneopods. 



Length, fi mm. 



Long Island Sound; Vineyard Sound (Smith); common at Woods Hole in the Eel Pond; off Gay 

 Head; Great Egg Harbor, New Jersey. 



